I have an NFC reader constantly polling for tags present. I also have a Nexus 5 with a HostApduService activated. When repeatedly tapping the Nexus 5 on the reader, the reader reports a FELICA (JIS: X6319-4) tag found in 9 out of 10 cases. About 1 in 10 it reports an ISO14443-3A device.
The latter is the expected behavior and the one described for Android HCE. I cannot find mention of this FELICA support anywhere. A OnePlus One only shows up as ISO14443-3A, for example.
Why does a Nexus 5 HCE show up as FELICA? And is there a way to disable this behavior?
[EDIT]: I have two Nexus 5 phones here, acting differently. This one acts like FELICA: Android 5.1, Build LMY47I. The other does not: Android 5.1.1, Build LMY48M